Simplify ind_agg0 creation, fix #75
Simplify ind_agg0 creation, fix #75

richardellison/spatial-microsim-book,Robinlovelace/spatial-microsim-book,Robinlovelace/spatial-microsim-book,jojo-/spatial-microsim-book,jojo-/spatial-microsim-book,Robinlovelace/spatial-microsim-book,richardellison/spatial-microsim-book,majazaloznik/spatial-microsim-book,majazaloznik/spatial-microsim-book,modumont/spatial-microsim-book,modumont/spatial-microsim-book,modumont/spatial-microsim-book